cocoa FTP connection authentication concern - macos

Question

I want to download a file from FTP connection for that I am using NSURL connection.
The connection have username and password.
If I pass the username and password in the url
ftp://user:password#ftp.example.com/foo/bar.zip
than it works fine. but I want to implement the authentication method where I can pass the password in the callback. But I am not receving any callbacks.
Below is the callback that I have implemented but it never gets called
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
Note:- I tried using Apple sample called SimpleFTPSample but it didnt helped.

Answer 1

To receive callbacks, please check both things:
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:requestToServer delegate:self startImmediately:YES];
^^^^^^ must be
And u must call it from main queue:
dispatch_async(dispatch_get_main_queue(), ^(void) { // u url part here
Then, u callbacks will be done, u can using authenticate part user name and pass trick can impossible to parse then from code:
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
NSString *user = [NSString stringWithFormat:#"%c%s%#", 'u', "se", #"r"];
NSString *password = [NSString stringWithFormat:#"%c%s%c%#", 'B', "FEBB", 'C', #"3CD036ED072A"];
NSURLCredential *credential = [NSURLCredential credentialWithUser:user
password:password
persistence:NSURLCredentialPersistenceForSession];
[[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
}
But as i know, user and pass will be sent anyway without any protection, so better solution is moving u content to https server. In that case u can be sure that u